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Sometimes I wonder how it would have turned out if Apple had gone the BeOS way.
Assuming that they would have been as successful, then Mac OS X (BeOS variant) and Windows would be both non UNIX systems as the mainstream platforms.
On the other hand, without Steve Jobs on board and the publicity to cater for UNIX fans to jump into Mac OS X (NextStep variant), most likely the strategy could have failed.
Anyway, this is just a what if from history that won't repeat itself, BeOS is gone.